The Solubility of Amorphous Silica at High Temperatures and High Pressures

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The solubility of amorphous silica in water at high temperatures and high pressures was investigated using commercial silica gel and fused quartz as starting materials. The experiments were carried out in a stainless steel bomb with an internal capacity of 89 cc. The weight of the silica starting material varied from 35 to 57 gm. Periodically, small amounts of solution (0.5 to 1.0 gm) were withdrawn in triplicate from the bottom of the bomb through a high pressure stainless steel capillary tube. Pressure was maintained almost constant by pumping water into the top of the bomb during sampling. The solutions ...
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Description

The solubility of amorphous silica in water at high temperatures and high pressures was investigated using commercial silica gel and fused quartz as starting materials. The experiments were carried out in a stainless steel bomb with an internal capacity of 89 cc. The weight of the silica starting material varied from 35 to 57 gm. Periodically, small amounts of solution (0.5 to 1.0 gm) were withdrawn in triplicate from the bottom of the bomb through a high pressure stainless steel capillary tube. Pressure was maintained almost constant by pumping water into the top of the bomb during sampling. The solutions were withdrawn through a filter (20 micron mean pore opening) inside the bomb, quenched in an ice bath before exiting from the capillary, and immediately diluted with previously weighted silica-free water. The diluted samples were analyzed for colorimetrically-reactive and total silica. The fused quartz usually gave similar amounts of colorimetric and total silica. The silica gel gave the same colorimetric silica as did the fused quartz, but higher and erratic amounts of total silica. The erratically-high total silica values probably were due to small amounts of very fine-grained solid particles of silica that disaggregated from the coarse-grained gelatinous starting material.